Two black holes colliding not enough? Make it three. ‘We have seen a visible signal from a previously invisible part of the universe.'. #Astronomy #science https://t.co/YHlQRSEVGw

Two black holes colliding not enough? Make it three. ‘We have seen a visible signal from a previously invisible part of the universe.'. #Astronomy #science https://t.co/YHlQRSEVGw

— Yusra Salim | يُسرى بِنْت سالم (@Shulab) June 30, 2020

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